Z Flashes vary quite a bit in stability but all have exceptional glide. There have been several runs of Z Flash which are overstable, including the current run. The overstable Flashes are superb forehand discs and would work well for anyone with a powerful backhand drive.

My primary drivers are overstable Z Flashes or the runs of Z Crushes which are less overstable than most. There is also a run from a few years back of Blue Z Flashes which fly dead nuts straight in my hands: these are perfect for long, straight tunnels.

For any disc which I really like, I make it a point to test each new run. So I always test Z Flashes, Z Crushes, Z Surge SS's and Rogues. The modern, big rim drivers will all vary from run to run but they are all useful and some are great. Since I like candy plastic, whatever the disc does will keep that flight path for a long time.

In the old days, before candy plastic, players would find a driver they liked and carry multiple versions in different degrees of broken in (at one time my bag had only X-Clones and putters in it but I still carried 15 to 20 discs). Now it takes years to break a disc in and an overstable driver may never get to the point where it becomes flippy as heck. So now I look for different runs of my favorite drivers to provide different shades of stability.